51666043 has 32 divisors (see below), whose sum is σ = 65644992. Its totient is φ = 39936000.

The previous prime is 51666037. The next prime is 51666047. The reversal of 51666043 is 34066615.

It is not a de Polignac number, because 51666043 - 2⁵ = 51666011 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51665996 and 51666014.

It is not an unprimeable number, because it can be changed into a prime (51666047) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 128643 + ... + 129043.

It is an arithmetic number, because the mean of its divisors is an integer number (2051406).

Almost surely, 2^51666043 is an apocalyptic number.

51666043 is a gapful number since it is divisible by the number (53) formed by its first and last digit.

51666043 is a deficient number, since it is larger than the sum of its proper divisors (13978949).

51666043 is a wasteful number, since it uses less digits than its factorization.

51666043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 51666043 is about 7187.9095013780. The cubic root of 51666043 is about 372.4503616874.

The spelling of 51666043 in words is "fifty-one million, six hundred sixty-six thousand, forty-three".